[gpac/el7] (28 commits) ...Update changelog

Summary of changes: 4f7a2c8... Rebuilt for ffmpeg-3.1.1 (*) 8c1d513... Fix build with openssl-1.1.0 (*) 3d069e5... - Rebuilt for https://fedoraproject.org/wiki/Fedora_26_Mass (*) 4ba89c1... Update to 0.7.1 (*) 7f7eb7e... - Rebuilt for https://fedoraproject.org/wiki/Fedora_27_Mass (*) 55f6c57... Rebuilt for ffmpeg-3.5 git (*) 28d72d7... add ffmpeg build fix (*) 66ad3a8... Try again with ffmpeg build fix (*) 5666093... Try again with ffmpeg build fix as the upstream fix looks b (*) 4e3aec8... - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass (*) 46b2e0c... - Rebuilt for new ffmpeg snapshot (*) ca0ecea... - Rebuilt for https://fedoraproject.org/wiki/Fedora_29_Mass (*) 6dd2cd9... Remove Group tag (*) e5954c7... Add missing isa on Requires (*) d21773a... Use one BuildRequires per line (*) 6f64c99... Drop mozilla support (*) 1afd4f6... Drop osmo support (*) c56c824... Drop f26 conditional (*) 8f4fc77... Use make macros (*) 53059f5... Use modern buildroot macro (*) cd899a7... Use new ldconfig scriptlet (*) 7681788... make buildroot macro consistent (*) 431812f... Use modern optflags macro (*) 884f723... Clean up (*) da4fa08... Update changelog (*) 943f0aa... Fix BuildRequires (*) 92830d2... Rename static sub-package (*) 9bd10a8... Update changelog (*) (*) This commit already existed in another branch; no separate mail sent